Brake-shoe.



M. R. DE FRANCE.

BRAKE SHOE.

APPLICATION FILED MAY 26, 1914.

Patented 0en.20,'1914.

Zoz'nesses W MW THE Nome PETERS CO., PHO'm-LITHQ, WASHINGTON4 D. C.

Wheel.y .e lMy invention consists, generally stated, in

UNITED STATES PATENT OFF 10E# MURRELL n. DE Pannen, or PITTSBURGH, Pnniisrnvanin, assitance'To PITTsPUne BRAKE Sironi COMPANY, on PITTSBURGH, PEnIvsYIivANIma CORPORATION or PENNSYLVANIA.

1,114,343.l y l The object 'of invention is to provide ak cheap, simple and efficient form of brake shoe which can be quickly'and conveniently L vmounted on the usual. hanger 'and one in e which thecasing may ybe pressed into shape for the insertion of the refractory frictional material. c

A further object of my invention is "to provide a brake shoe 'having' apressed steel casing in which the side walls yof the same are tapered in order to reduce the bearing surface of the steel on they tread.: ofthe thenovel arrangement, construction and combination of parts as hereinafter more specifically set forth and described and vparticularly pointed out inthe claims.

To enable others skilled in the art to which my invention appertains to construct and use improved brake shoe, Iwill describe the same more fully, referring toy the" accompanying drawing in which Figure l is a side view of my improved brake shoe. Fig. 2 is a longitudinal sectional view of the same. Fig. Sis a cross sectional view of the same on the line 3-"8 of Fig. l. f f

Like symbols of reference herein indicate like yparts in each of the figures of the draw ino.

ts illustrated in the drawing, my improved brake shoe 1 comprises an inclosing casing 2 and a fillingA of frictional material for bearing on the car wheel. The casing 2 is preferably formed of sheet or plate metal having a sufficient degree of strength and consists of theback wall 3, the end Walls i and the side walls 5. The casing is open at its front and is curved to conform to the pe- Specifcation of Letters Patent. `Application filed May 26, 1914. Serial N0.*841,004.

:BRAKE-SHOE.

riphery of the car vwheel upon whichA said shoe is tobe' used; yThe usual `supporting lug 6 isconnected'or'fixed to the back 3 of the casing 2 in any suitable manner for con- Pateiitea oet. 2o, i914.-

necting the shoe 1 to the ordinarybrakeheadcor hanger'r (not `sliown), and is preferlably formed of a separate piece of material, as shown, and has its finner ends 7 passed through slots 8' in said 'back and turned j against the-inner face of the 'same to secure said lug in position. At each end ofthe back?) is a short bearing surface 9 which is 'y n adapted to abut against bearings onrthe ends of the brake-head or hanger, while central or intermediate bearings on" said L head `or hangerare adapted to abut 'against said back on, each side of the "lug 6. The sides of the casing@ aretapered, as shownin F ig. '3, whilethe endwalls Ll'thereof are uniforinin thickness throughout their entire height `as shown inl Fig. 2.# "In addition lto ybeingtapered, vthe side walls y1l are preferably corrugated as shown and' siiclr'casing`-contains l the frictional member 10 "for exerting the rubbing or breaking pj action `onfthe car wheel. This frictional member 8 consists of any suitable material suchlas cast Viron for a k .1 composition of kmaterials, .speciallyk prepared for 'the purpose,l and of suchy a character as tofeXert proper and sufficient friction uponk theperiphery of thecar wheel without any u-ndue or excessive pressure.'` These 'compo-pf.y

sitions are well known inl :the art `and .the

filling 10 is either cast ,intofxthe casingQ y ,when set inl a mold orinsertedin suchcasingunder pressure and retained in position after hardening, by the walls 3, 4 and 5 of the said casing.

My iinprovedvbrake shoe mayhave' the(k side walls 5 of the casing 1 formed straight or made with the corrugations. One ofthe greatest objections to the use of brake shoes having pressed steel casing is the factA that the edges of the casing gradually score or bite into the periphery of the car wheel and thus injure the saine and this is particularly true of casings having their side `walls straight. Corrugating such side walls` assists materially in reducing this objectional feature as it ,distributes the area onto which said wallsy bear.y It will be noticed that 1I have'tapered the side walls 5 of the casing 2 so that the metal at the open end ofthe shoev will be about one-half the thickness of l v service, and is particularly soin cases Where the emergency brake is applied. In such a case the metal is very readily melted and spreads so as to cause larger Wearing surfaces and consequently larger scores in the tread of the Wheel. Themetal in the'side Walls 5 cannot be reduced in thickness throughout its entire height on account of weakening the same so that it would not have sufficient strength to hold the frio usually discarded, While With my improved type the metal will not pile up or broaden i out nearly so readily so that it can be used longer than the shoe having its sidewalls i tional member 8 in position in the casing 1, Whereas the tapering of said side Walls Will not reduce the strength of the same and Will tend to reduce the amount of steel bearing on the tread of the Wheel. This reduction in the area of the steel of the side Walls 5 Will also enable the shoe to be used longer than shoes with the metal in said Walls being uniform in thiclmess, as the latter type Will have a great amount of steel bearing on the tread of the Wheel when they are Worn down about half Way and are then uniform in thickness.

It will readily be seen that when the shoe is iirst` applied to the car Wheel there Will be but half the amount of Wearing surface of steel thereon compared to the amount bearing on such Wheel When the side Walls are made uniform in thickness and consequently there Will be less metal to melt and pile up When the friction becomes excessive.

Various modifications and changes in the design and construction of my improved brake shoe may be resorted to Without departing from the spirit of the invention or sacricing any of its advantages.

i What I claim as my invention and desire to secure by Letters Patent is l. A brake shoe comprising a sheet metal casing and a lling of frictional material, said casing having the material in its side Walls tapered.

2. A brake shoe comprising a sheet metal casing and a filling of frictional material, said casing being provided with ends and sides around said material and terminating flush with the bottom edge thereof, and the material forming said sides being tapered.

3. A brake shoe comprising a sheet metal casing and a filling of frictional material, said sides being corrugated and the material forming said sides being tapered.

ll. A brake shoe comprising a sheet metal casing and a filling of frictional material, said casing being provided'with ends and sides around said material and terminating flush With the bottom `edge thereof, said sides being corrugated and the material forming said sides being tapered.

s 5. As a new article of manufacture, a sheet steel brake shoe casing having the material forming its side Walls tapered.

6. As a new article of manufacture, a sheet steel brake shoe casing having the material .forming its side Walls corrugated and tapered.

In testimony whereof, I, the said MURRELL It. DE FRANCE, have hereunto set my hand.

MURRELL R. DE FRANCE.

, Witnesses: i

T. B. HUMPHRIES, M.. A. BUSHMAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. i 

